IBM BS029ML - WebSphere Portal Server Self Help Manual page 122

The traces can be enabled statically through the WebSphere Application Server's
Administrative Console (under the Configuration tab), or by directly editing the file server.xml
for that application server. Alternatively, the traces can also be enabled dynamically through
the Runtime tab of the Admin console of the WebSphere Application Server, or the Enable
Tracing portlet within WebSphere Portal administration (select Administration → Portal
Analysis → Enable Tracing), as shown in Figure 4-6.
Figure 4-6 Enable Tracing portlet
The static approach requires a system restart, which is not always desirable. The dynamic
option is preferred under some circumstances, for example, the server cannot be brought
down and restarted. The customers have to be aware of the impact on performance, however.
The runtime option uses the memory buffer from the Java Virtual Machine (JVM) heap.
Depending on the settings on the memory buffer, a certain amount of memory on the heap
will be used for the logging. We recommend setting the traces when you want to recreate the
scenario and disable them when the recreation of the scenario is completed.
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IBM WebSphere Portal V6 Self Help Guide